The reactor itself is 16 ft in diameter, 85 ft tall, and resembles a grain silo. It processes 4,200,000 gallons of oil a day. Inside the reactor there is nearly 500,000 lbs of catalyst that aid in the removal of organic Sulfur and Nitrogen from the oil to reduce total Sulfur and Nitrogen content in the finished gasoline.

Since it is so large there are many different catalyst layers within the reactor, but most of them contain some combination of Nickel, Cobalt, and Molybdenum.